Abstract
AN important recent advance in our understanding of sedimentation in flysch basins is the discovery that the internal structures of most graded sandstones and limestones follow a fixed sequence. Proceeding upwards in a graded bed, the model-sequence described by Bouma1 consists of five structures: (A) graded division; (B) lower division of horizontal lamination; (C) division of current ripple lamination, often deformed into convolute lamination; (D) upper division of horizontal lamination; (E) pelite division (Fig. 1). This sequence, or partial sequences with base, middle, and/or top truncation of one or more of the divisions, characterizes graded sandstones and limestones in many flysch basins in North America and Europe.
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References
Bouma, A. H., Sedimentology of some Flysch Deposits (Elsevier Publishing Co., 1962).
Walker, R. G., Proc. Yorkshire Geol. Soc., 35 (1965).
Simons, D. B., and Richardson, E. V., J. Hydraul. Div., Proc. Amer. Soc. Civil Eng., 87, No. HY3 (1961).
Harms, J. C., and Fahnestock, R. K., in Primary Structures and their Hydrodynamic Interpretation, Soc. Econ. Paleo. and Min. Spec. Pub. No. 12, Pl. 1 (1965).
Simons, D. B., Richardson, E. V., and Haushild, W. L., U.S. Geol. Survey Water-Supply Paper, 1498-G (1963).
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HUBERT, J. Modification of the Model for Internal Structures in Graded Beds to include a Dune Division. Nature 211, 614–615 (1966). https://doi.org/10.1038/211614a0
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DOI: https://doi.org/10.1038/211614a0
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